Conservation by Cloning: Cow Carries Endangered Ox Species, Study Reports. Scientists expect the cow will be able to carry the implanted embryo of the endangered Asian gaur to term in late November. The embryo was grown from skin cells of a deceased gaur fused to an extracted cow egg. The procedure is a prelude to growing clones of frankly extinct species; the team plans to clone a species of Spanish mountain goat that became extinct nine months ago. They temper their self-congratulation with the caveat that biotechnological maneuvers are no substitute for protecting species in their natural habitats in the first place.